Engine valve mechanism



J. C. GLENN.

ENGINE VALVE MECHANISM.

APPLICATION FILED JUNE 27, I919.

1,354,966, I Patented Oct. 5,1920.

WEE 11pm r. v @fiW ED STATES:

FQ TENT OFFICE.

JOHN C. GLENN, OF ERIE, PENNSYLVANIA, ASSIGNOLEL TO SKINNER ENGINE COMPANY, OF ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

ENGINE VALVE MECHANISM.

Application filed. June 27, 1919.

T 0 all whom it may concern Be it known that I, JOHN C. GLENN, a citizen of the United States, residing at Erie, in the county of Erie and State of ennsylvania, have invented certain new and useful Improvements in Engine Valve Mechanism; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will onable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming part of this specification.

This invention relates to steam engine valves and valve seats in that type of engine valves known as double-seat puppet valves.

The object of this invention is to provide a double-seat puppet valve with one fixed seat and another yielding seat whereby the expansion and contraction of the parts are provided for in such a manner that both seats are at all times operative. This result is accomplished by securing the valve to a suitable operating stem adapted to operate the valve in the usual manner. The valve body is hollow and is provided at one end with an annular seating-surface adapted to engage a suitable valve-seat. At the opposite end of the valve there is a yielding seat adapted to receive and seat an annular seating-surface on the end of the valve; this yielding seat being capable only of a limited movement toward and away from the end of the valve so as to compensate for expansion and contraction in the body of the valve, so that it will at all times operate on the seats at both ends of the valve with equal efficiency.

The features of this invention are hereinafter fully set forth and explained and illustrated in the accompanying drawing, in which: A indicates a section of a steam engine frame, B a section of the steam cylinder, 0 the piston operating therein, D a hollow cylinder head, all of the usual construction. Preferably in the hollow cylinder head D there is secured to the wall D thereof a valve casing E provided with an opening 6 through the wall D. Through the upper wall E of the valve casing E there is an opening e for the admission of steam to the inside of the valve casing E; and around this opening 6 there is an annular valve seat F; and in the lower wall E of the valve casing E there is a circular depression G G Specification of Letters Patent.

Patented Oct. 5, 1920. Serial No. 307,064.

in which there is mounted a lower valve seat H. This valve seat H is provided with an annular seating-surface H around its perlphery and is preferably provided with a hollow downward extension H in which there is a spiral spring h operating normally to move the valve seat H upward, which movement is, however, limited by the bolt 72. passing through the center of the valve seat H and down into the lower wall E of the valve casing. Between the under surface of the valve seat H and 'the lower wall E of the valve casing there is an annular steam space I which communicates by means of holes 2' through the valve seat H with the inside of the valve. Around the periphery of the movable valve seat H there are piston rings 2" to prevent leakage of steam around the valve seat H. On the central part of the upper face of the valve seat there is an upwardly extending sleeve J to receive and operate as a guide for the lower end of the central part K of the valve L in which the valve stem K is secured.

The valve L is preferably provided with an annular outer wall L provided at its lower end with an annular seating-surface Z adapted to engage the yielding valve seat H; this outer wall being connected to the central stem K by means of radial arms L The upper end of the wall L of the valve, is preferably continued upward and outward so as to form an annular seating-surface f adapted to engage the annular valve seat F on the upper wall E of the valve casing E.

In operation, when the valve L is raised, steam passes from the outside of the valve between the valve seats F f and from the inside of the valve between the valve seats H Z. The upper seating-surfaces F f being slightly larger in diameter that the seatingsurfaces H Z provides for a slight over balance whereby the seating of the valve on its seats is always assured.

I have thus shown and described a convenient construction embodying my invention. It is obvious however, that many parts thereof may be modified without departing from the spirit of the invention; therefore what I claim as new and desire to secure by Letters-Patent is 1. In a double seat steam engine valve mechanism, a chambered valve casing having a circular opening in the upper wall thereof, and a cylindrical recess in the lower wall thereof, an annular valve seat surrounding the opening in said upper wall, a circular disk, a central hub on the under sur spring'in said cylindrical recess adapted to press upwardly against said disk, means to limit the upward movement of said disk, and a hollow valve engaging and operating on each of said annular valve seats, substantially as set forth.

2. In a double seat engine valve mechanism, a valve casing having a circular opening in its upper wall and a cylindrical recess inits lower wall, a fixed annular valve seat around the opening in said upper Wall,

a disk, an annular valve seat thereon, a downwardly extending cylindrical hub on said disk slidably fitted in said cylindrical recess, a spring in said recess adapted to raise said disk upwardly, means to limit the upward movement thereof, a hollow cylindrical huh on the upper side of said disk, adouble seat hollow valve adapted to seat upon said annular valve seats and a hub on said valve adapted to slidably operate in the hollow cylindrical hub on the upper side of said disk, substantially as set forth. 7

In testimony whereof I affix my signature.

JOHN C. GLENN. 

